KR101861225B1 - Vent plug for tire vulcanizing mold - Google Patents

Abstract

The present invention discloses a vent plug of a tire vulcanization mold.
A vent plug of a tire vulcanizing mold according to the present invention is inserted into a vent hole formed in a tire vulcanizing mold and discharges residual air inside the vulcanizing mold to the outside. The vent plug of the tire vulcanizing mold is coupled to a vent hole of the vulcanizing mold A valve stem movably installed in the air passage; and a valve stem, which is pushed by the pressure of the rubber contained in the vulcanization mold and is in contact with the casing to seal the air passage, A valve member having a vent cap coupled to one end of the valve stem; a stator seat portion disposed on the inner surface of the casing to provide an elastic repulsive force to the valve member; and a moving member provided on the valve member to generate an elastic repulsive force And a magnet portion. In this case, It is possible to stably perform the air discharge operation from the vulcanized metal mold and to easily maintain the maintenance of the tire because the problem that the tire rubber adhering to the inside of the casing with the air during vulcanization is adhered to the spring for actuating the valve member is fundamentally cut off, It is possible to drastically lower the defective surface of the bearing.

Description

[0001] The present invention relates to a vent plug for tire vulcanizing mold,

The present invention relates to a vent plug for a tire vulcanization mold, and more particularly to a vent plug for a vulcanization mold, which substantially obviates the problem that a tire rubber introduced into a casing together with air during vulcanization attaches to a spring for actuating a valve member, The present invention relates to a vent plug of a tire vulcanization mold capable of stably performing an air discharge operation and also capable of remarkably lowering a bearing defect on a tire surface by simple maintenance.

Tires are usually manufactured through a refining process, a semi-finished product process, a molding process, a vulcanizing process, and are marketed after an inspection process for selecting defective products in the manufacturing process. A brief description of each manufacturing process of a tire is as follows.

The refining process is a process of mixing all the components of the tire, such as natural rubber, synthetic rubber, reinforcing agents such as carbon black, and vulcanizing agents made of chemicals including sulfur, into rubber for tire, These include extrusion, rolling, cutting, and bead processes.

The molding process is a process of making semifinished products into a cylindrical rubber composite by sequentially assembling the semifinished products onto a molding machine drum, and a cylindrical green case is made through the molding process.

When a green case is put into a mold that serves as a mold, heat and pressure are applied, and the vulcanized rubber and vulcanized carbon are completely cured, and the tire is finished with elasticity.

In the vulcanizing process, a vulcanizing device is used in which a vulcanizing mold is mounted inside and a green case is heated. An air bag or a bladder is installed in the vulcanization device to apply heat and pressure to the green case to adhere the green case to the vulcanization mold and a device to heat the vulcanization mold to supply the heat to the vulcanization mold do.

High-pressure steam is used as the heating medium used in the vulcanization.

The tire vulcanizing mold has a vent hole for discharging the air generated when vulcanizing, thereby discharging air through the vent hole.

On the other hand, a ventless type mold which does not cause venting is used in order to prevent the appearance quality of the finished tire due to the molded rubber from deteriorating. A ventless type mold includes a vent plug with a valve that can be opened and closed. A valve type valve plug that can be opened and closed prevents the valve from being opened when the air is discharged, and the valve is closed when the tire is vulcanized. do.

Korean Patent Laid-Open Publication No. 2015-0140044 discloses a conventional vent plug as shown in FIG. 6. The conventional vent plug 10 includes a casing 12 installed in a vent hole of a vulcanization mold, A valve member 15 provided in the hollow portion 13 and a spring 19 providing an elastic force to the valve member 15. The valve member 15 includes a vent cap 16, And a stopper 18 provided at a lower end of the valve stem 17 for restricting a moving distance of the valve member 15, (TR) flows into the case, and the molded rubber is generated outside the green case. In addition, it is necessary to remove the molded rubber formed in the green case through a separate process. When removing the food waste formed in the green case, And cuts out the waste paper, The South Rim is its declining quality appearance of the finished tire.

In the conventional vent plug 10, the tire rubber TR, which flows into the casing 12 together with the air during continuous vulcanization, tends to adhere to the spring 19 inside the casing 12, There is a problem that the rubber is adhered, the air discharge operation is not performed smoothly and the bear is defective.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a tire airbag apparatus and a tire airbag apparatus which substantially obviate the problem that tire rubber, The present invention also provides a vent plug of a tire vulcanizing mold, which can remarkably reduce a bearing defect on a tire surface.

In order to solve the above-described technical problem, the present invention provides a vent plug for a tire vulcanizing mold, which is inserted into a vent hole formed in a tire vulcanization mold to discharge residual air inside the vulcanization mold to the outside, A valve stem movably installed in the air passage; and an air passage communicating with the air passage while being pushed by the pressure of the rubber contained in the air passage, A valve member having a vent plug coupled to one end of the valve stem to provide a resilient repulsive force to the valve member; and a valve member provided on the valve member to generate an elastic repulsive force with the valve stem, Characterized in that it comprises a moving magnet section It provides a vent plug.

According to an embodiment of the present invention, the stator stone portion and the moving magnet portion may have opposite magnetic directions.

According to another embodiment of the present invention, the inner surface of the casing may further include a second fixed magnet portion having the same magnetic force direction as the stationary magnet portion.

 According to another embodiment of the present invention, the valve member may further include a second moving magnet portion having the same magnetic force direction as the moving magnet portion.

According to the present invention, it is possible to reliably perform the air discharge operation from the vulcanized metal mold by stably interrupting the problem that the tire rubber introduced into the casing together with the air during vulcanization adheres to the spring for actuating the valve member, Maintenance is also simple, which can drastically reduce bearings on the tire surface.

1 is an exploded perspective view of a vent plug according to the present invention,
2 is a cross-sectional view of a vent plug according to an embodiment of the present invention,
Fig. 3 is a cross-sectional view showing a shape in which the vent plug is closed by the vulcanized tire,
FIG. 4 is a view illustrating a configuration in which a valve member is removed by inserting a separation bar into a separation hole of a vent plug casing of the present invention,
5 is a cross-sectional view of a vent plug according to another embodiment of the present invention,
6 is a cross-sectional view of a conventional vent plug, in which (a) is a state in which an opening is opened, and (b) is a state in which a spring is not properly operated due to a foreign matter of a tire rubber.

Hereinafter, the present invention will be described in more detail.

It is to be noted that the technical terms used in the present invention are used only to describe specific embodiments and are not intended to limit the present invention, and the technical terms used in the present invention are defined in the present invention in a different sense It is to be understood that the present invention should not be construed in an overly broad sense or in an excessively reduced sense by a person having ordinary skill in the art to which the present invention belongs.

In addition, when a technical term used in the present invention is an erroneous technical term that does not accurately express the concept of the present invention, it should be understood that technical terms can be understood by those skilled in the art. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

In addition, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise. For example, the terms "comprise" It is to be understood that the various steps need not necessarily be construed as encompassing all, some of the elements or portions of the steps may not be included, or may include additional elements or steps.

FIG. 2 is a cross-sectional view of a vent plug according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing a vent plug closed by a vulcanized tire, And FIG. 4 is a view illustrating a configuration in which a valve member is removed by inserting a separation bar into a separation hole of a vent plug casing of the present invention, and FIG. 5 is a sectional view of a vent plug according to another embodiment of the present invention.

 The vent plug 100 of a tire vulcanization mold according to the present invention is a vent plug of a tire vulcanizing mold which is inserted into a vent hole (not shown) formed in a tire vulcanization mold to discharge residual air inside the vulcanization mold to the outside, A casing 110 coupled to the vent hole of the vulcanization mold and having an air passage 112 for air flow; a valve stem 122 movably installed in the air passage; And a vent cap (124) coupled to one end of the valve stem so as to be in contact with the casing and to seal the air passage while being pressed by a pressure of the valve stem And a moving magnet portion 140 provided on the valve member to generate an elastic repulsive force with the stator stone portion. It is characterized.

The valve stem of the valve member is inserted into the air passage 112 which is a hole penetrating the inside of the casing, and when the valve stem 122 is further advanced, the bent stopper 124 fixed at one end moves to enter the opening of the air passage 112 113 are closed, and when they are moved in opposite directions, the openings are opened and the residual air can be discharged to the outside.

Here, it is advantageous to form the opening 113 so as to have a tapered inclined surface corresponding to an inverted conical shape as in the conventional art, and the vent cap can also be provided in a shape that can be closely attached to the inclined surface.

When the vulcanizing is started in the state of being fastened to the vent hole of the vulcanizing mold, the vent cap 124 maintains the state away from the opening 113 and performs the vulcanization. When the vulcanized tire T is vulcanized at the time of terminating vulcanization, In order to vulcanize the next entering green tire, the vent plug must be returned to its original state and the opening must be kept open. For this purpose, the vent cap should be kept at a certain distance.

In order to maintain the spacing of the vent plugs, a stator seat portion 130 'is disposed on the inner surface of the casing so as to provide an elastic repulsive force to the valve member 120. The movable magnet portion The vent plug 124 can be kept apart from the opening by the repulsive repulsive force of the vent pipe 140.

Therefore, it is preferable that the stationary stone portion 130 'is provided in a direction opposite to the direction of the magnetic force with the moving magnet portion 140 in order to make the repulsive force repulsive force, Position.

Here, it is necessary to limit the moving space of the moving magnet unit in order to prevent the separation distance between the vent cap 124 and the opening 113 or the detachment due to mechanical vibrations. To this end, .

In this case, the movable magnet unit 140 is disposed in the space between the fixed magnets 130 and 130 ', and the fixed magnet units are arranged in the same magnetic force direction, while the movable magnet unit is movable in a direction different from the fixed magnet unit, When the vulcanization process is completed and the tire T presses the vent plug to seal the opening, the vent pipe is separated from the opening by the repulsive force of the second stator seat portion The vent plug is continuously pushing the tire at the same time and can be reopened when the tire is removed.

Here, the stationary magnets 130 and 130 'can be fixed to the inner surface of the casing forming the air passage 112 directly with bolts or adhesives interposed therebetween. In addition, a fastening groove (not shown) It is of course possible to use a fixed magnet to be inserted and fixed by being provided in a negative shape corresponding to the outer shape of the fixed magnet.

Meanwhile, the valve member 120 may further include a second moving magnet portion 140 'having the same magnetic force direction as the moving magnet portion with the fixed stone portion 130 interposed therebetween. Thus, the casing 110 The vent pipe 124 is maintained in a state of being spaced apart from the opening by the action of a repulsive force with the stator seat 130 provided on the inner surface thereof being interposed therebetween so that even when the tire T is pushed to close the opening, So that it is possible to maintain the state in which the openings are separated from each other even in the next vulcanization.

Here, the movable magnets 140 and 140 'may be fixed to the outer surface of the valve stem 122 directly by bolts or adhesives. In addition, a fastening groove (not shown) And the movable magnet can be inserted and fixed and used.

Further, even when there is the tire rubber TR to be introduced at the time of vulcanization, since the opening and closing by the magnetic force is performed, it is possible to fundamentally remove the defects such as the obstruction by the foreign matter. It is possible to remove the valve member 120 by inserting the separation bar B through the separation hole 114 extending through the air passage 112 of the air flow passage 112 and allowing maintenance and maintenance of the air passage.

Vent plug 100, casing 110,
An air passage 112, an opening 113,
The separation hole 114, the valve member 120,
Valve stem 122, vent cap 124,
A stator stone portion 130 ', a second stator stone portion 130,
The moving magnet section 140, the second moving magnet section 140 '
Separation rods B, tires T,
Tire rubber TR

Claims (4)

delete delete A vent plug of a tire vulcanizing mold which is inserted into a vent hole formed in a tire vulcanizing mold to discharge residual air inside the vulcanizing mold to the outside,
A casing coupled to the vent hole of the vulcanizing mold and having an air passage for air flow;
A valve stem movably installed in the air passage and a vent cap coupled to one end of the valve stem so as to be in contact with the casing while being pushed by the pressure of the rubber contained in the vulcanization mold to seal the air passage A valve member;
A stator seat portion disposed on an inner surface of the casing to provide an elastic repulsive force to the valve member; And
And a moving magnet portion provided on the valve member whose magnetic force direction is opposite to that of the fixed stone portion to generate an elastic repulsive force,
And a second fixed magnet portion having a magnetic force direction identical to that of the stationary magnet portion is further provided on the inner surface of the casing. The movable magnet portion is disposed between the stationary magnet portion and the second stationary magnet portion,
Wherein the moving magnet portion is disposed in a direction different from that of the stator seat portion, so that the vent plug is kept spaced apart from the opening portion.
The method of claim 3,
Wherein the valve member is further provided with a second moving magnet portion in the same direction as the moving magnet portion in the magnetic force direction.

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